If you keep talking to Bill's grandfather on route 25 and show him the Pokemon he asks for, eventually he will ask to see a "Pokemon with 6 tails", meaning Vulpix. Show him a vulpix and he will give you a fire stone. Or, once you get all 16 badges, you can purchase it with your athlete points at the Pokeathlon dome on certain days.
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you can win one somedays at pokeatholon
no you can trade soulsilver pokemon to black
You could show either a Growlithe (Heart Gold) or a Vulpix (Soul Silver) to Bill's Grandfather at Route 25, or you can buy it at the Pokeathlon Dome on Tuesdays for 2500 points.
With a Firestone you can evolve into a Eevee into a Flareon, A Vulpix into a Ninetails and a Growlithe into a Artacaine
firestones are for Pokemon who only are fire types